6w5o: Difference between revisions
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==Class D beta-lactamase BAT-2 delta mutant== | ==Class D beta-lactamase BAT-2 delta mutant== | ||
<StructureSection load='6w5o' size='340' side='right'caption='[[6w5o]]' scene=''> | <StructureSection load='6w5o' size='340' side='right'caption='[[6w5o]], [[Resolution|resolution]] 2.55Å' scene=''> | ||
== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6W5O OCA]. For a <b>guided tour on the structure components</b> use [ | <table><tr><td colspan='2'>[[6w5o]] is a 8 chain structure with sequence from [https://en.wikipedia.org/wiki/Bacillus_atrophaeus_1942 Bacillus atrophaeus 1942]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6W5O OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6W5O FirstGlance]. <br> | ||
</td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[ | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.55Å</td></tr> | ||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=FLC:CITRATE+ANION'>FLC</scene>, <scene name='pdbligand=KCX:LYSINE+NZ-CARBOXYLIC+ACID'>KCX</scene></td></tr> | |||
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=6w5o FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6w5o OCA], [https://pdbe.org/6w5o PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6w5o RCSB], [https://www.ebi.ac.uk/pdbsum/6w5o PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6w5o ProSAT]</span></td></tr> | |||
</table> | </table> | ||
== Function == | |||
[https://www.uniprot.org/uniprot/A0A0H3EA14_BACA1 A0A0H3EA14_BACA1] | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
The expression of beta-lactamases is a major mechanism of bacterial resistance to the beta-lactam antibiotics. Four molecular classes of beta-lactamases have been described (A, B, C and D), however until recently the class D enzymes were thought to exist only in Gram-negative bacteria. In the last few years, class D enzymes have been discovered in several species of Gram-positive microorganisms, such as Bacillus and Clostridia, and an investigation of their kinetic and structural properties has begun in earnest. Interestingly, it was observed that some species of Bacillus produce two distinct class D beta-lactamases, one highly active and the other with only basal catalytic activity. Analysis of amino acid sequences of active (BPU-1 from Bacillus pumilus) and inactive (BSU-2 from Bacillus subtilis and BAT-2 from Bacillus atrophaeus) enzymes suggests that presence of three additional amino acid residues in one of the surface loops of inefficient beta-lactamases may be responsible for their severely diminished activity. Our structural and docking studies show that the elongated loop of these enzymes severely restricts binding of substrates. Deletion of the three residues from the loops of BSU-2 and BAT-2 beta-lactamases relieves the steric hindrance and results in a significant increase in the catalytic activity of the enzymes. These data show that this surface loop plays an important role in modulation of the catalytic activity of Bacillus class D beta-lactamases. | |||
A Surface Loop Modulates Activity of the Bacillus Class D beta-Lactamases.,Stewart NK, Bhattacharya M, Toth M, Smith CA, Vakulenko SB J Struct Biol. 2020 Jun 5:107544. doi: 10.1016/j.jsb.2020.107544. PMID:32512156<ref>PMID:32512156</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 6w5o" style="background-color:#fffaf0;"></div> | |||
==See Also== | |||
*[[Beta-lactamase 3D structures|Beta-lactamase 3D structures]] | |||
== References == | |||
<references/> | |||
__TOC__ | __TOC__ | ||
</StructureSection> | </StructureSection> | ||
[[Category: Bacillus atrophaeus 1942]] | |||
[[Category: Large Structures]] | [[Category: Large Structures]] | ||
[[Category: Smith CA]] | [[Category: Smith CA]] | ||
Latest revision as of 17:17, 18 October 2023
Class D beta-lactamase BAT-2 delta mutantClass D beta-lactamase BAT-2 delta mutant
Structural highlights
FunctionPublication Abstract from PubMedThe expression of beta-lactamases is a major mechanism of bacterial resistance to the beta-lactam antibiotics. Four molecular classes of beta-lactamases have been described (A, B, C and D), however until recently the class D enzymes were thought to exist only in Gram-negative bacteria. In the last few years, class D enzymes have been discovered in several species of Gram-positive microorganisms, such as Bacillus and Clostridia, and an investigation of their kinetic and structural properties has begun in earnest. Interestingly, it was observed that some species of Bacillus produce two distinct class D beta-lactamases, one highly active and the other with only basal catalytic activity. Analysis of amino acid sequences of active (BPU-1 from Bacillus pumilus) and inactive (BSU-2 from Bacillus subtilis and BAT-2 from Bacillus atrophaeus) enzymes suggests that presence of three additional amino acid residues in one of the surface loops of inefficient beta-lactamases may be responsible for their severely diminished activity. Our structural and docking studies show that the elongated loop of these enzymes severely restricts binding of substrates. Deletion of the three residues from the loops of BSU-2 and BAT-2 beta-lactamases relieves the steric hindrance and results in a significant increase in the catalytic activity of the enzymes. These data show that this surface loop plays an important role in modulation of the catalytic activity of Bacillus class D beta-lactamases. A Surface Loop Modulates Activity of the Bacillus Class D beta-Lactamases.,Stewart NK, Bhattacharya M, Toth M, Smith CA, Vakulenko SB J Struct Biol. 2020 Jun 5:107544. doi: 10.1016/j.jsb.2020.107544. PMID:32512156[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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